android与服务器通信，连接，Struts2也可以(自用)

package com.connection;

import java.io.ByteArrayOutputStream;

import java.io.DataOutputStream;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.Map;

import org.json.JSONObject;

import android.content.Context;

public class Connection {

public static String encoding="UTF-8";

public static String baseUrl="http://192.168.1.101:8080/";

public static String postData(Context context,Map params,String requestUrl) throws Exception{

String result=null;

String data="";

StringBuffer sb = new StringBuffer();

//组装数据，形如：aaa=admin&bbb=123

// if(params!=null){

// for (Map.Entry entry : params.entrySet()) {

// sb.append(entry.getKey()).append("=").append(URLEncoder.encode(entry.getValue(), encoding));

// sb.append("&");

// }

// //组装完成的数据

// data = sb.deleteCharAt(sb.length() - 1).toString();

// }

//转换为json样子

if(params!=null){

JSONObject n=new JSONObject(params);

data="data="+URLEncoder.encode(n.toString(),"UTF-8");//特别强调，这里的设置时为了防止乱码

}

//传入请求的路径

URL url = new URL(Connection.baseUrl+requestUrl);

//打开连接

HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();

// 设置提交方式

httpConn.setDoOutput(true);

httpConn.setDoInput(true);

httpConn.setRequestMethod("POST");

// post方式不能使用缓存

httpConn.setUseCaches(false);

httpConn.setInstanceFollowRedirects(true);

httpConn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

// 维持长连接

httpConn.setRequestProperty("Connection", "Keep-Alive");

// 设置浏览器编码

httpConn.setRequestProperty("Charset", "UTF-8");

httpConn.setRequestProperty("contentType", "UTF-8");

httpConn.setRequestProperty("Accept-Charset", "UTF-8");

DataOutputStream dos = new DataOutputStream(httpConn.getOutputStream());

// 将请求参数数据向服务器端发送

dos.writeBytes(data);

dos.flush();

dos.close();

//接受数据的工作

InputStream inputStream=null;

if (httpConn.getResponseCode() == 200) {

// 获得服务器端输出流

inputStream=httpConn.getInputStream();

byte[] reserveData = readStream(inputStream);

result=new String(reserveData);

return result;

}

return null;

}

//通过输入流获得字节数组  

public static byte[] readStream(InputStream is) throws Exception {

byte[] buffer = new byte[1024];  

ByteArrayOutputStream bos = new ByteArrayOutputStream();

int len = 0;

while((len=is.read(buffer)) != -1){

bos.write(buffer, 0, len);

}

is.close();

return bos.toByteArray();

}  

}

服务端处理：

//客户端登陆方法

public ActionForward telUserLoging(HttpServletRequest request,

HttpServletResponse response, ActionMapping mapping)

throws Exception {

this.reserJson=this.reserveJsongData(request);

JSONObject json=new JSONObject();

if(reserJson.get("account").equals("wang")&&reserJson.get("pwd").equals("123")){

json.put("accountId", "success");

}else{

json.put("accountId", "faile");

}

return gotoAndroidClient(request, json);

}

//最后的跳转方法————公用

public ActionForward gotoAndroidClient(HttpServletRequest request,JSONObject json){

request.setAttribute("resultStr", json.toString());

return new ActionForward("/forandroid/result.jsp", false);

}

//最前的接收数据方法————公用

public JSONObject reserveJsongData(HttpServletRequest request){

String data=request.getParameter("data");

return JSONObject.fromObject(data);

}